What size does hand luggage have to be going to Florida?

Question

I am going to Florida next week from gatwick, and was wondering what size hand luggage on the plane has to be?

I just bought a new backpack, and it says on the site that it is:

Height: 48cm

Width: 31cm

Depth: 13cm

would that be okay??

Answer 1

the measurements are 22 x 14 x 9( in inches)  1 inches = 2.54 centimeters.  I travel frequently between Florida Detroit and Chicago.  Although your carry on item might be within the size guidelines issued by the airline, that does not guarantee it will fit under the seat in front of you